Replaced nullptr by 0
Replaced nullptr by 0

dcarpy/apm_planner,diydrones/apm_planner,dcarpy/apm_planner,dcarpy/apm_planner,dcarpy/apm_planner,diydrones/apm_planner,diydrones/apm_planner,diydrones/apm_planner,diydrones/apm_planner,dcarpy/apm_planner,dcarpy/apm_planner,diydrones/apm_planner